发布时间:2025-01-30 13:28:45
楼上的基本正确了.
单个吊环受的是纯拉力,负载能力是看螺纹的大小.两个时受的是拉力和剪应力.而最重要的是剪应力.因为受力区只是螺杆的横截面,比起受拉力的螺纹截面小多了.
家里安装的地暖上图是采暖炉下图是控制阀请问分水阀上下两排分别控制的是什么怎样开关地暖
2025-01-30 13:28:45 2025-01-30 13:28:45 2025-01-30 13:28:45 2025-01-30 13:28:45 2025-01-30 13:28:45 2025-01-30 13:28:45 2025-01-30 13:28:45 2025-01-30 13:28:45 2025-01-30 13:28:45 2025-01-30 13:28:45 2025-01-30 13:28:45 2025-01-30 13:28:45 2025-01-30 13:28:45 2025-01-30 13:28:45小米电视用u盘看3d电影左右格式的怎么调节才能看见3d效果啊
2025-01-30 13:28:45 2025-01-30 13:28:45 2025-01-30 13:28:45 2025-01-30 13:28:45 2025-01-30 13:28:45 2025-01-30 13:28:45 2025-01-30 13:28:45 2025-01-30 13:28:45 2025-01-30 13:28:45 2025-01-30 13:28:45 2025-01-30 13:28:45 2025-01-30 13:28:45 2025-01-30 13:28:45